CN102875805A - Three-dimensional graphene-poly dopamine-gold nanoparticle composite material and preparation method thereof - Google Patents
Three-dimensional graphene-poly dopamine-gold nanoparticle composite material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a three-dimensional graphene-poly dopamine-gold nanoparticle composite material and a preparation method thereof. The method includes the following steps of (1) dissolving dopamine in a buffer solution with potential of hydrogen (pH) of 7 to 9 to obtain a dopamine solution; (2) immersing three-dimensional graphene in the dopamine solution to subject the three-dimensional graphene to modification to obtain a poly dopamine modified three-dimensional graphene; and (3) adding the poly dopamine modified three-dimensional graphene in a chloroauric acid solution to fully react to obtain the three-dimensional graphene-poly dopamine-gold nanoparticle composite material. The three-dimensional graphene-poly dopamine-gold nanoparticle composite material has the advantages that advantages of graphene, poly dopamine and gold nanoparticles are combined, the electric conductivity is high, the biocompatibility is good, the composite material is easy to derivatize, and the composite material can be used for preparing a deoxyribonucleic acid (DNA) electrochemical sensor for recognizing a complementary DNA strand.
Description
Technical field
The present invention relates to a kind of graphene composite material, relate in particular to a kind of three-dimensional grapheme-poly-Dopamine HCL-golden nanometer particle composite manufacture method.
Background technology
Graphene (graphene) is a kind of new carbon, and it has by the tightly packed bi-dimensional cellular shape crystalline structure that forms of monolayer carbon atom.Graphene has caused everybody common concern at present because of its unique physics and chemical property.Graphene unique and perfectly structure make it have the excellent characteristics such as electricity, mechanics, calorifics and optics, except two-dimentional grapheme material, scientist in 2004 with the foamed metal that has plane and curved-surface structure characteristics concurrently as growing substrate, the spumescence Graphene body material that utilizes the CVD method to prepare to have the three-dimensional networks structure.Research finds that this three-dimensional grapheme body material has intactly copied the structure of foamed metal, and Graphene consists of the integral body of a full-mesh in the mode of seamless link, have excellent charge-conduction ability ,～850m
2The specific surface area of/g ,～99.7% porosity and～5mg/cm
3Extra-low density.Therefore, the three-dimensional grapheme material since density low, be rich in macropore and meso-hole structure, good conductivity, high specific surface area and thermostability, have important potential using value in fields such as electrochemical capacitance, hydrogen storage material, secondary cell and new catalytics.Be further to expand the three-dimensional grapheme material sensing with analyze in application, the modification of three-dimensional grapheme and compound most important with functional material thereof.
Dopamine HCL is the key component in the marine mussel adhesion protein cross-linking process.The material that existing lot of documents report is modified wish carries out simple dip-coating and can form the composite bed that brute force is attached to the surfaces of various materials such as mineral substance, metal and polymer in dopamine solution.Its mechanism is that Dopamine HCL easily is oxidized to the DOPA quinone, anti-disproportionation reaction occurs between DOPA quinone and the Dopamine HCL form free radical, thus crosslinking polymerization, perhaps the amino generation reversal of the Michael addition of quinonyl and Dopamine HCL molecule forms poly-Dopamine HCL.Therefore, poly-Dopamine HCL modification is a kind of simple to operate, pervasive material modification method.In addition, there are some researches prove that the amino in the poly-Dopamine HCL material can be used as reductive agent, effectively in-situ reducing hydrochloro-auric acid, the directly poly-Dopamine HCL of preparation-hydrochloro-auric acid matrix material.
Summary of the invention
The invention provides a kind of three-dimensional grapheme-poly-Dopamine HCL-golden nanometer particle composite manufacture method, the advantage of this composite material concurrent Graphene, poly-Dopamine HCL, golden nanometer particle, electric conductivity height, good biocompatibility, be easy to derivatize, have potential application at the electrochemica biological sensory field.
A kind of three-dimensional grapheme-poly-Dopamine HCL-golden nanometer particle composite manufacture method may further comprise the steps:
(1) Dopamine HCL is dissolved in the damping fluid of pH7～9, makes dopamine solution;
(2) three-dimensional grapheme is immersed in the dopamine solution three-dimensional grapheme is carried out modifying and decorating, make poly-Dopamine HCL and modify three-dimensional grapheme;
(3) will gather Dopamine HCL modification three-dimensional grapheme and join in the tetra chlorauric acid solution, after reacting completely, make three-dimensional grapheme-poly-Dopamine HCL-golden nanometer particle matrix material.
Under the weak basic condition, Dopamine HCL concrete reactional equation poly-and the poly-Dopamine HCL of generation is as follows:
Described damping fluid can be selected phosphoric acid buffer commonly used, and it does not participate in reaction, and pH value variable range is large, and concentration is preferably 0.02～0.2mol/L, and the pH value is preferably 7.5～8.5, and more preferably 8.5.
The modification amount of the immersion time of three-dimensional grapheme and the concentration affects poly of dopamine solution bar amine, the solubility of described dopamine solution is preferably 0.1～5mg/mL, and the time that described three-dimensional grapheme immerses dopamine solution is preferably 0.5～2h.
The concentration of described tetra chlorauric acid solution is preferably 0.1～2%, and the time of described reaction is preferably 2～12h.
The present invention also provides the three-dimensional grapheme that described preparation method makes-poly-Dopamine HCL-golden nanometer particle matrix material.
Three-dimensional grapheme is rich in macropore and meso-hole structure, good conductivity, can directly use as the electrode without support; Amino and hydroxyl abundant in the poly-Dopamine HCL improve material wetting ability and biocompatibility; Golden nanometer particle can pass through the direct immobilized sulfydryl single stranded DNA of gold-sulfide linkage effect, and therefore, three-dimensional grapheme of the present invention-poly-Dopamine HCL-golden nanometer particle matrix material can be used for preparing the DNA electrochemical sensor of identifying complementary dna chain.
With respect to prior art, beneficial effect of the present invention is:
(1) three-dimensional grapheme of the present invention is rich in macropore and meso-hole structure, good conductivity, specific surface area is large, can directly use as the electrode without support.
(2) because containing poly-Dopamine HCL layer, three-dimensional grapheme of the present invention-poly-Dopamine HCL-golden nanometer particle matrix material wetting ability, good biocompatibility.
(3) the golden nanometer particle preparation method of three-dimensional grapheme of the present invention-poly-Dopamine HCL-golden nanometer particle matrix material simple, be easy to derivatize.
Description of drawings
Fig. 1 is in the embodiment of the invention 1, the scanning electron microscope (SEM) photograph of three-dimensional grapheme.(a) magnification is 85 times, and (b) magnification is 3500 times.
Fig. 2 is in the embodiment of the invention 1, and three-dimensional grapheme (a) and poly-Dopamine HCL are modified three-dimensional grapheme (b) to the contact angle figure of water, and contact angle is respectively 127.8 ° (a), 82.15 ° (b).
Fig. 3 is in the embodiment of the invention 1, and three-dimensional grapheme (a) and poly-Dopamine HCL are modified three-dimensional grapheme (b) at the K that contains KCl (0.1mol/L)
3Fe (CN)
4/ K
2Fe (CN)
4Cyclic voltammogram (1mmol/L).
Fig. 4 is in the embodiment of the invention 1, the scanning electron microscope (SEM) photograph of three-dimensional grapheme-poly-Dopamine HCL-golden nanometer particle matrix material.(a) magnification is 2000 times, and (b) magnification is 8000 times.
Fig. 5 is in the embodiment of the invention 1, the energy-dispersive spectroscopy figure of three-dimensional grapheme-poly-Dopamine HCL-golden nanometer particle matrix material.
Embodiment
Embodiment 1
(1) with dopamine solution pH is 8.5, in the phosphoric acid buffer of concentration 0.05mol/L, makes the dopamine solution that concentration is 2mg/mL;
(2) three-dimensional grapheme is joined advance modifying and decorating in the dopamine solution, take out dryly behind the 0.5h, make poly-Dopamine HCL and modify three-dimensional grapheme;
(3) will gather Dopamine HCL modification three-dimensional grapheme and join in the tetra chlorauric acid solution of concentration 1%, make three-dimensional grapheme-poly-Dopamine HCL-golden nanometer particle matrix material behind the reaction 4h.
Subsequently, to modify the operations such as three-dimensional grapheme, three-dimensional grapheme-poly-Dopamine HCL-golden nanometer particle matrix material electro-chemical test, electron-microscope scanning through the poly-Dopamine HCL of step (2)～(3) preparation, the Measurement results that obtains is shown in Fig. 1～5.
The scanning electron microscope (SEM) photograph of three-dimensional grapheme shown in Figure 1 shows that three-dimensional grapheme is the integral body of a full-mesh, is rich in macropore and meso-hole structure, and high multiple scanning electron microscope (SEM) photograph has shown graphene-structured.
Contact angle test result shown in Figure 2 shows that poly-Dopamine HCL is modified three-dimensional grapheme and had the contact angle lower than three-dimensional grapheme.
Fig. 3 three-dimensional grapheme and poly-Dopamine HCL are modified three-dimensional grapheme and are being contained small molecules electron transfer mediator (K
3Fe (CN)
4/ K
2Fe (CN)
4) cyclic voltammogram in the solution shows that three-dimensional grapheme and poly-Dopamine HCL are modified three-dimensional grapheme and had similar electrochemical signals, K
3Fe (CN)
4/ K
2Fe (CN)
4The redox spike potential consistent, electric current increases due to the three-dimensional grapheme but poly-Dopamine HCL is modified.This is owing to gathering the electron transfer mediator of the faint positive electricity in Dopamine HCL surface to negative charge inrichment to be arranged.
The scanning electron microscope (SEM) photograph of Fig. 4 three-dimensional grapheme-poly-Dopamine HCL-golden nanometer particle matrix material shows that composite material surface is evenly distributed with the golden nanometer particle that particle diameter is 100-200nm.
Fig. 5 energy-dispersive spectroscopy chart understands that C, O, Au signal exist simultaneously in three-dimensional grapheme-poly-Dopamine HCL-golden nanometer particle matrix material.
Above interpretation of result result has proved the effective preparation on three-dimensional grapheme of poly-Dopamine HCL, golden nanometer particle, i.e. effective preparation of three-dimensional grapheme-poly-Dopamine HCL-golden nanometer particle matrix material.
(1) with dopamine solution pH is 8.5, in the phosphoric acid buffer of concentration 0.1mol/L, makes the dopamine solution that concentration is 1mg/mL;
(2) three-dimensional grapheme is joined advance modifying and decorating in the dopamine solution, take out dryly behind the 1h, make poly-Dopamine HCL and modify three-dimensional grapheme;
(3) will gather Dopamine HCL modification three-dimensional grapheme and join in the tetra chlorauric acid solution of concentration 1%, make three-dimensional grapheme-poly-Dopamine HCL-golden nanometer particle matrix material behind the reaction 10h.
Prove that after tested the three-dimensional grapheme of embodiment 2 preparations-poly-Dopamine HCL-golden nanometer particle composites possesses good electrochemical activity, the water contact angle of reduction, golden nanometer particle is evenly distributed.
Claims (10)
1. a three-dimensional grapheme-poly-Dopamine HCL-golden nanometer particle composite manufacture method may further comprise the steps:
(1) Dopamine HCL is dissolved in the damping fluid of pH7～9, makes dopamine solution;
(2) three-dimensional grapheme is immersed in the dopamine solution three-dimensional grapheme is carried out modifying and decorating, make poly-Dopamine HCL and modify three-dimensional grapheme;
(3) will gather Dopamine HCL modification three-dimensional grapheme and join in the tetra chlorauric acid solution, after reacting completely, make three-dimensional grapheme-poly-Dopamine HCL-golden nanometer particle matrix material.
2. preparation method as claimed in claim 1 is characterized in that, described damping fluid is phosphoric acid buffer.
3. preparation method as claimed in claim 2 is characterized in that, the concentration of described phosphoric acid buffer is 0.02～0.2mol/L.
4. preparation method as claimed in claim 1 is characterized in that, the pH value of described damping fluid is 7.5～8.5.
5. preparation method as claimed in claim 4 is characterized in that, the pH value of described damping fluid is 8.5.
6. preparation method as claimed in claim 1 is characterized in that, the concentration of described dopamine solution is 0.1～5mg/mL.
7. preparation method as claimed in claim 1 is characterized in that, the time that described three-dimensional grapheme immerses dopamine solution is 0.5～2h.
8. preparation method as claimed in claim 1 is characterized in that, the concentration 0.1～2% of described tetra chlorauric acid solution.
9. preparation method as claimed in claim 1 is characterized in that, in the step (3), the time of described reaction is 2～12h.
10. the three-dimensional grapheme that the preparation method makes as described in arbitrary such as claim 1～9-poly-Dopamine HCL-golden nanometer particle matrix material.
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